Tanking is effectively a liquid coating those bonds to damp stonework and then cures to form a waterproof barrier. Tanking is ideal for wet or damp walls and keeping water and moisture at bay to prevent it from damaging inner surfaces. The traditional method of dealing with this was to secure the inner wall surface out and panel over the top of it. This would be ok for a while but due to the moisture presence, eventually the wooden paneling would itself become damp and then rot. As technology has evolved, this eventually gave birth to tanking.
EB Substrate uses various ways for tanking wet walls and  can provide technical information, obtain manufacturers' support, and offer the best possible price range.